Dave, it sounds like you don't have a lot of faith in our aspiring photographer here
When you first got your camera, how often did you shoot in "P" mode or "green box" mode? After owning my 350D for two years, I have never once shot in anything other than M, Av or Tv, and would not hesitate to trade it in for a 1D if I had the opportunity (and the funds). If Ooztuncer did his research on Fredmiranda, DPR, etc. and is even considering a 1-series, he must be at least somewhat serious about taking up the hobby and I honestly can't see him relying on the auto shooting modes that the 350D offers. The 350D is a camera aimed at the typical consumer who goes to Best Buy and is talked into a DSLR by the salesperson behind the counter, walks away with the camera, kit lens, a memory card, cleaning kit, and all that gear will likely be the first and last photographic gear he purchases. While the 350D is still very much so a capable system, a serious photographer may find that its shortcomings (build, size, autofocus, yucky viewfinder) outweigh its advantages over the other options.
Anywho, the situation does change a bit when it comes to "your first camera." As Dave mentioned, the 350D is much cheaper than the 1D right now, and depending on your financial situation, you are actually much better off going with the cheapest camera body and spending the rest of your money on lenses. And while the 1D is a nice camera, it is only as nice as its glass allows it to be, and I would much rather own a 350D and a foray of good glass than a 1D and, I dunno, a mere 50/1.8.
As for you, Ooztuncer, your best bet is probably to stick with a cheaper body. Have you considered the 20D? It is right in between the entry-level Rebels and the pro-level 1-series, and used bodies go for pretty cheap these days (~$500).
Anyway, in reality the camera body you end up getting isn't really going to matter that much in the long run. Glass > camera, so dedicate the bulk of your research and funds towards the lenses you'll purchase instead of the body.